-No capability flags are currently defined. Unknown capability flags
-should be treated as late ones.
+Currently, the low 16 bits are allocated for negotiating bulk-crypto
+transforms. Bits 8 to 15 are used by Secnet as default capability
+numbers for the various kinds of transform closures: bit 8 is for the
+original CBCMAC-based transform, and bit 9 for the new EAX transform;
+bits 10 to 15 are reserved for future expansion. The the low eight bits
+are reserved for local use, e.g., to allow migration from one set of
+parameters for a particular transform to a different, incompatible set
+of parameters for the same transform. The high 16 bits have not yet
+been assigned a purpose.
+
+No early capability bits are currently defined.